From 214cb8a6934f9682ce5a9d7a7f5a76801c7822e6 Mon Sep 17 00:00:00 2001
From: Marcus Artner <git@martner.at>
Date: Tue, 26 Jan 2021 17:11:50 +0100
Subject: [PATCH] Fixed Issue #264: <thead> element removed from <table> if
 there are no <tbody> or <tr> elements (#283)

---
 library/HTMLPurifier/ChildDef/Table.php   |  2 +-
 tests/HTMLPurifier/ChildDef/TableTest.php | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/library/HTMLPurifier/ChildDef/Table.php b/library/HTMLPurifier/ChildDef/Table.php
index cb6b3e6c..67c7e953 100644
--- a/library/HTMLPurifier/ChildDef/Table.php
+++ b/library/HTMLPurifier/ChildDef/Table.php
@@ -164,7 +164,7 @@ class HTMLPurifier_ChildDef_Table extends HTMLPurifier_ChildDef
             }
         }
 
-        if (empty($content)) {
+        if (empty($content) && $thead === false && $tfoot === false) {
             return false;
         }
 
diff --git a/tests/HTMLPurifier/ChildDef/TableTest.php b/tests/HTMLPurifier/ChildDef/TableTest.php
index 49e96b65..aba6b1dc 100644
--- a/tests/HTMLPurifier/ChildDef/TableTest.php
+++ b/tests/HTMLPurifier/ChildDef/TableTest.php
@@ -44,6 +44,22 @@ class HTMLPurifier_ChildDef_TableTest extends HTMLPurifier_ChildDefHarness
         );
     }
 
+    public function testTheadOnlyNotRemoved()
+    {
+        $this->assertResult(
+            '<thead><tr><th>a</th></tr></thead>',
+            '<thead><tr><th>a</th></tr></thead>'
+        );
+    }
+
+    public function testTbodyOnlyNotRemoved()
+    {
+        $this->assertResult(
+            '<tbody><tr><th>a</th></tr></tbody>',
+            '<tbody><tr><th>a</th></tr></tbody>'
+        );
+    }
+
     public function testTrOverflowAndClose()
     {
         $this->assertResult(